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Kapiti Coast Airport at Paraparaumu has made substantial changes to avoid a repetition of the mid-air collision which tragically killed three men, a Wellington inquest into their deaths heard today.

When the crash happened late morning on February 17, 2008, the increasingly popular aerodrome was not certificated. It is now, and yesterday a new commercial service to Auckland was launched.

Heather Woodcock, airport manager for less than a year, said Air Nelson was now operating 18 return flights a week between Paraparaumu and Auckland.

Families of the three men who died _ David Fielding, 30, the student pilot he was testing in the R22 helicopter, James Taylor, 19, and the solo pilot of the Cessna 152, Bevan Hookway, 17 _ have spent two long days listening to the evidence.

The chopper occupants were doing an auto rotation manoeuvre and Bevan Hookway was making preparations to land the light plane when they collided. There had been no hint of trouble beforehand.

The R22 fell through the roof of Placemakers' store in Paraparaumu, narrowly missing staff and customers. The plane fuselage landed about 250 metres away in a cul-de-sac and the engine smashed onto a house.

Ms Woodcock said helicopter training was no longer allowed to be based at Kapiti Coast Airport and the former operation had relocated to Palmerston North.

A separate area of the aerodrome had since been allocated for helicopter use, and choppers and fixed-wing aircraft now both used either right or left handed circuits above the airport when looking to land. At the time of the collision, they flew opposing circuits - a practice discouraged by the Civil Aviation Society.

Circuit height had reverted to 1000 feet above ground level for fixed wing aircraft and 800ft for choppers since the accident, she said.